using System;

namespace Windy.TurtleDrawing
{
    public static class AngleUtility
    {
        public static double ToDegree(this double radian)
        {
            return radian * 180 / Math.PI;
        }

        public static double ToRadian(this double degree)
        {
            return degree * Math.PI / 180;
        }

        public static double NormalizeAngleDegree(this double degree)
        {
            if (degree >= 0.0)
            {
                while (degree >= 180.0)
                {
                    degree -= 360.0;
                }
            }
            else
            {
                while (degree < -180.0)
                {
                    degree += 360.0;
                }
            }

            return degree;
        }

        public static double NormalizeAngleRadian(this double radian)
        {
            if (radian >= 0.0)
            {
                while (radian >= Math.PI)
                {
                    radian -= Math.PI * 2;
                }
            }
            else
            {
                while (radian < -Math.PI)
                {
                    radian += Math.PI * 2;
                }
            }

            return radian;
        }
    }
}
